Nanoengineered composite materials with giant dielectric anisotropy

Tom G. Mackay

doi:10.1117/12.2187185

8 July 2015 Nanoengineered composite materials with giant dielectric anisotropy

Tom G. Mackay

Proceedings Volume 9558, Nanostructured Thin Films VIII; 95580E (2015) https://doi.org/10.1117/12.2187185
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

A nanoengineered composite material was considered in the long–wavelength regime. It consisted of a random mixture of two isotropic dielectric component materials. Each component material was composed of oriented spheroidal particles. The Bruggeman formalism was used to estimate the permittivity dyadic of the corresponding homogenized composite material (HCM). If the rotational symmetry axes of the two populations of spheroids were mutually orthogonal then the HCM was an orthorhombic biaxial material; if these two symmetry axes were mutually parallel then the HCM was a uniaxial material. The degree of anisotropy of the HCM increased as the shape of the component particles became more elongated, with the greatest degrees of anisotropy being attained when the component particles were shaped as needles or discs. Hence, nanoengineered composite materials based on simple oriented component particles may be homogenized to realize extremely large degrees of anisotropy.

Citation Download Citation

Tom G. Mackay "Nanoengineered composite materials with giant dielectric anisotropy", Proc. SPIE 9558, Nanostructured Thin Films VIII, 95580E (8 July 2015); https://doi.org/10.1117/12.2187185

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